You can ask first if there is any way that you can have a place to yourself, perfectly fine for you to ask this. Maybe figure out in advance a brief way you can explain why you don't want room mates, without going into a lot of detail.

I've had some bad experiences sharing a living space and also some good experiences. You might actually have good room mates!

If you at least have a room to yourself with a door you can close, hopefully that will help a lot.

Good luck!